U.S. patent number 3,851,349 [Application Number 05/400,955] was granted by the patent office on 1974-12-03 for floor scrubber flow divider.
This patent grant is currently assigned to Clarke-Gravely Corporation. Invention is credited to Dale E. Lowder.
United States Patent |
3,851,349 |
Lowder |
December 3, 1974 |
FLOOR SCRUBBER FLOW DIVIDER
Abstract
A floor scrubber having a pair of scrubbing brushes, a supply
source for cleaning solution and a flow divider through which
cleaning solution passes as it flows to the brushes. The flow
divider includes an inlet chamber and a pair of outlet chambers.
The inlet chamber has a plurality of outlet passageways into the
outlet chambers arranged at different levels. The outlet
passageways are of increasing diameters from the lower to the upper
portions thereof to thereby cause the liquid solution to be evenly
divided between the two outlet chambers for delivery to the brushes
regardless of whether the rate of flow is relatively high or
relatively low. BACKGROUND OF THE INVENTION In prior art floor
scrubbers, delivery of the scrubbing solution to the separate
scrubber heads is typically done by allowing solution to flow from
a reservoir into a divider chamber having separate outlets, each
joined by a conduit to the separate scrubber brushes. In systems of
this type, when the flow of solution is quite high, the fluid is
fairly evenly distributed to the brushes. However, frequently, the
operator wants only a small flow of solution to the scrubber
brushes and under these circumstances the solution tends to divide
in the divider chamber quite unevenly. Indeed, the flow is
typically relatively low in order to avoid flooding. Accordingly,
more of the solution goes to one scrubbing brush than to the other.
SUMMARY OF THE INVENTION The present invention overcomes the
problems existant in the prior art devices by providing a flow
divider having separate outlet chambers, each outlet chamber being
connected through suitable conduit to the scrub brushes. The flow
divider has an inlet chamber which includes a number of symmetrical
sets of fluid passageways, each of which sets empties into an
outlet chamber. The passageways in each set are arranged vertically
and the lowermost is the smallest with succeeding passageways
increasing in flow area. When the flow of solution into the inlet
is low, the fluid exits from the inlet chamber to the outlet
chambers through only the lowermost small passageways. This causes
the solution to be divided more evenly between the outlet chambers
than would be the case if the passageways were large. If the
passageways were large, it would be too easy for the bulk of the
fluid to flow out through only one passageway rather than evenly
through all. As fluid flow increases, it is allowed to flow through
the larger diameter passageways as well as through the smaller.
Thus, the flow is not impeded and yet it is still divided evenly
between the outlet chambers. The many important objects and
advantages of the present invention will become fully appreciated
by those skilled in the art upon reading the following description
with reference to the accompanying drawings illustrating a
preferred and an alternate embodiment of the invention.
Inventors: |
Lowder; Dale E. (Muskegon,
MI) |
Assignee: |
Clarke-Gravely Corporation
(Muskegan, MI)
|
Family
ID: |
23585690 |
Appl.
No.: |
05/400,955 |
Filed: |
September 26, 1973 |
Current U.S.
Class: |
15/50.1; 222/478;
401/35; 401/270 |
Current CPC
Class: |
A47L
11/408 (20130101); A47L 11/145 (20130101) |
Current International
Class: |
A47L
11/00 (20060101); A47L 11/14 (20060101); A47l
011/03 () |
Field of
Search: |
;15/5C,5R,98,320
;134/100,101 ;68/17R ;222/478X,482,486,489,330
;401/9,34,35,270 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Roberts; Edward L.
Attorney, Agent or Firm: Price, Heneveld, Huizenga &
Cooper
Claims
The embodiments of the invention in which an exclusive property or
privilege is claimed are defined as follows:
1. In a surface treating device having at least a pair of surface
treating elements, and a supply source of liquid for distribution
to said surface treating elements, apparatus for distributing
liquid from the supply source into at least said pair of associated
surface treating elements, said distribution apparatus
comprising:
a housing having an inlet chamber adapted for connection to said
source to receive fluid therefrom;
a pair of fluid outlet chambers in said housing, each of said
outlet chambers adapted to receive a portion of the liquid from
said inlet chamber and direct the same to one of said surface
treating elements; and
flow control means between said inlet chamber and each of said
outlet chambers, said flow control means including a set of a
plurality of outlet passageways formed between said inlet chamber
and each of said outlet chambers, said passageways being of
graduated proportion to permit an increase of fluid flow from said
inlet chamber to each of said outlet chambers as the fluid flow in
said inlet chamber increases.
2. The apparatus as defined in claim 1 wherein said passageways in
each said set are arranged vertically at different levels between
said inlet and outlet chambers, the lowermost passageway in each
said set being smallest in flow area with succeedingly higher
passageways increasing in flow area size at succeeding levels.
3. The apparatus as defined in claim 2 wherein said plurality of
sets of passageways are symmetrically arranged between said inlet
and said outlet chambers, each said set having a passageway at the
same level as a passageway in another set, and those passageways at
corresponding levels having the same flow area.
4. The apparatus as defined in claim 3 and further including wall
means dividing said housing into said outlet chambers, each said
outlet chamber having an open top, said outlet passageways opening
into said outlet chambers below the level of the top of said outlet
chambers.
5. The apparatus as defined in claim 3 wherein said inlet chamber
is vertically oriented in said housing and said outlet chambers are
arranged thereabout.
6. The apparatus as defined in claim 3 wherein each said set
includes two of said outlet passageways.
7. The apparatus as defined in claim 3 wherein each said set
includes three of said outlet passageways.
8. The apparatus as defined in claim 1 and further including wall
means dividing said housing into two outlet chambers, said wall
means including an enlarged portion which is hollow to define said
inlet chamber, one set of said passageways being formed in said
wall means on one side of said inlet chamber and the other set
being formed in said wall means on the other side of said inlet
chamber.
9. The apparatus as defined in claim 1 and further including wall
means dividing said housing into said outlet chambers, each said
outlet chamber having an open top, said outlet passageways opening
into said outlet chambers below the level of the top of said outlet
chambers.
10. In a surface treatment apparatus having fluid supply source, at
least a pair of surface treatment elements, means connecting said
source to outlet at said elements, and a flow divider for evenly
distributing the fluid from said source at said elements, the
improvement in said flow divider comprising:
a housing;
means in said housing forming an inlet chamber and at least a pair
of outlet chambers;
flow control means between said inlet chamber and each of said
outlet chambers, said flow control means including a set of outlet
passageways formed between said inlet chamber and each said outlet
chamber, said passageways in each said set being arranged at
different levels, each said passageway in each said level having a
flow area of increasing graduated proportion to permit an increase
of fluid flow from said inlet chamber to each said outlet chamber
as the liquid flow from said source increases and rises in said
inlet chamber.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view illustrating the flow divider
connected between a supply source and the surface treatment
elements, with everything but the flow divider being shown
schematically;
FIG. 2 is a top plan view of the flow divider shown in FIG. 1;
FIG. 3 is a cross-sectional view of the flow divider taken along
the plane III--III of FIG. 2;
FIG. 4 is a cross-sectional view of the flow divider taken along
the plane IV--IV of FIG. 2; and
FIG. 5 is a perspective view of an alternate embodiment of the flow
divider .
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIGS. 1-4 of the drawings, the flow divider of the
invention, generally designated by the numeral 10, is adapted for
positioning between a supply source 12 and at least a pair of
scrubber brushes or surface treatment elements 14 and 16. Suitable
conduit 18 and 19 connects the supply source through a metering
valve 20 to an inlet chamber 50 formed in a central portion of the
flow divider. Outlet chambers 60 and 60' formed in the flow divider
on each side of inlet 50 are connected by conduits 22, 24,
respectively to outlets in the vicinity of scrubber brushes 14 and
16, respectively. Inlet chamber 50 includes a set of holes on each
side thereof, one set comprising holes 53 and 54 and the other
comprising 53' and 54', one of which sets empties into outlet
chamber 60 and the other of which empties into outlet chamber 60'.
The holes 53 and 53' in each set respectively are the lowermost
outlets from inlet chamber 50 and also have the smallest flow area.
Outlets 54 and 54' in each set are positioned above outlets 53 and
53' and are larger in flow area.
Flow divider 10 is generally rectangular in shape having a front
wall 40, a pair of side walls 42 and 42', bottom wall 44 and a back
wall 46. A divider wall 48 is centrally disposed between side walls
42 and 42' and extends from front wall 40 toward back wall 46.
Divider wall 48 flares outwardly having a thickened portion
adjacent back wall 46 in which inlet chamber 50 comprising
generally a vertical hollow column is formed. Inlet chamber 50 is
machined downwardly from an upper portion of the housing and is
threaded at its upper end to receive a plug 56 (FIG. 1). A fluid
inlet passageway 52 is formed through rear wall 46 and into the
upper portion of chamber 50. Inlet chamber 52 is adapted by means
of suitable connecting means (not shown) for connection to the
previously described conduit 19 for connection to the fluid supply
source 12.
Wall 48 divides the housing into a pair of independent outlet
chambers 60 and 60'. The outlet chambers are defined by the front,
back, side, bottom and divider walls of flow divider 10. Each
outlet chamber 60 and 60' includes an outlet opening 64 and 64',
respectively, each of which is adapted to receive connecting means
as a nipple or the like (not shown) for connection to conduits 22
and 24, respectively.
Rear wall 46 includes a pair of spaced-apart bosses 49 which may be
machined as by drilling and tapping as required to facilitate the
mounting of flow divider 10 within the scrubber apparatus. Since
these bosses per se form no part of the present invention, they
will not be described in further detail.
At inlet chamber 50, flow control means is provided for evenly
dividing and distributing the fluid from the inlet chamber to each
of outlet chambers 60 and 60'. The flow control means includes a
pair of outlet passages 53 and 54 opening from chamber 50 into
outlet chamber 60 and similar outlet passageways 53' and 54'
opening from chamber 50 to outlet chamber 60'. Each of these
passageways are of graduated proportions to permit an increase of
fluid flow from inlet chamber 50 to each of the outlet chambers 60
and 60' as the liquid level in the inlet chamber increases.
Specifically, these passageways are located in walls 48a and 48b
forming the sides of inlet chamber 50 and are located at
predetermined levels above bottom surfaces 62 and 62' of the outlet
chambers at a distance established from the top of the housing to
prevent splashing. The lowermost openings 53 and 53' are on the
same level, each having a relatively small diameter. Upper openings
54 and 54' are in alignment with each other at a second level and
are also located a predetermined distance above lower surfaces 62
and 62' and are located above openings 53 and 53'. Since openings
54 and 54' have a larger diameter or effective flow area than do
lower openings 53 and 53' they serve to admit greater quantities of
fluid from inlet chamber 50 to outlet chambers 60 and 60' as the
flow and consequently the fluid level rises in chamber 50. For
convenience in machining these openings, an opening is provided in
side wall 42 which is closed by a plug member 58 after the
passageways are drilled and prior to actual use of flow divider
10.
In a preferred embodiment of the invention, the lowermost smaller
openings 53 and 53' each have a diameter of approximately 3/32 of
an inch which provides an effective flow area at each opening of
approximately 0.0069 square inches. The upper larger openings 54
and 54' have a diameter of 3/16 of an inch thereby providing a flow
area of approximately 0.0276 square inches.
The outlet passageways are on the same level, the level being
parallel to the top of housing 10. All of the outlet passageways
are spaced downwardly from the top of the housing to prevent
splashing of the fluid passing therethrough. In the preferred
embodiment, the centers of the upper larger openings 54 and 54' are
spaced downwardly from the top about one and one-quarter inches.
The smaller lower openings 53 and 53' are spaced downwardly about 1
5/16 inches from the top.
In operation, fluid from supply source 12 flows through conduit 18
where its flow rate is adjusted by control valve 20. From the
control valve 20, the fluid passing through conduit 19 enters inlet
passageway 52 and inlet chamber 50. When the flow of fluid into
chamber 50 is quite low, it exits through outlet passageways 53 and
53' into outlet chambers 60 and 60'. From thence it passes through
openings 64 and 64' and conduits 22, 24 where it is deposited in
the vicinity of brushes 14 and 16. Because outlet passageways 53
and 53' are quite small, they cause the fluid in chamber 50 to be
divided evenly between chambers 60 and 60'. As fluid flow from the
source increases as controlled by valve 20, the fluid rises in
chamber 50 and flows additionally through outlet passageways 54 and
54' into each of the outlet chambers. Thus, the flow is not impeded
and yet is still divided evenly between chambers 60 and 60'.
ALTERNATE EMBODIMENT OF THE INVENTION
In FIG. 5, an alternate embodiment of the invention is illustrated
wherein the main components therein are identified by reference
numerals similar to those used in the previous embodiment but
prefixed by the numeral 1. Basically housing 110 includes front
wall 140, side walls 142 and 142', bottom wall 144, back wall 146
and divider wall 148. These walls cooperatively form a pair of
outlet chambers 160 and 160'. Outlet nipples 164 and 164' extend
through front wall 140 for connection to suitable conduit to direct
the fluid to scrubber elements. In this embodiment, rear wall 146
is somewhat higher than the side, front and divider walls forming
the outlet chambers and may be secured by fastening means 70
passing therethrough to the framework 72 of the floor treatment
apparatus.
The inlet chamber 150 formed at the juncture of the divider wall
148 and rear wall 146 also extends upwardly with rear wall 146
above the level of the walls forming chambers 160 and 160'. An
inlet passageway 152 to the upper part of chamber 150 is adapted
for connection to a fluid supply source.
A set of outlet passageways (only one set is shown) 153, 154, and
74 are provided at three different levels along and through each of
the walls 148a and 148b, opening into the outlet chambers. In this
embodiment as in the previous embodiment, the outlet passageways
through chamber walls 148a and 148b progressively increase in size
from the smaller lowermost passageway 153, intermediate passageway
152 to the largest passageway 74 at the upper level.
Operation of this embodiment is essentially identical to the
previously described embodiment except that an additional higher
level of passageways 74 is provided. The use of an additional
passageway 74 may be used to accommodate either (1) a greater
overall flow rate of the fluid as compared to the first embodiment
or (2) alternately a greater control over the same flow rate. For
the first alternative, the bottom two passageways, 153 and 154, in
each set would have the same effective flow area as passageways 53
and 54. The top passageway 74 could be somewhat larger. For the
second alternative, the bottom passageways 153 and 154 would be
smaller than their counterparts 53 and 54, while top larger
passageway 74 could be sufficiently large that the set of three
holes, 153, 154 and 74, would be of as great an overall flow area
as the two passageways 53 and 54.
From the foregoing description and drawings, those skilled in the
art will readily appreciate that the cleaning apparatus and flow
divider of the present invention provides a means for fairly evenly
dividing fluid at even low rates of fluid flow while still
facilitating the division and handling of greater fluid flow rates.
Although a specific and an alternate embodiment of the invention
have been described and illustrated in detail, those skilled in the
art will also appreciate that other modifications can be made in
light of the foregoing disclosure. These modifications accordingly
are to be considered as included in the appended claims unless
these claims by their language expressly state otherwise.
* * * * *